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Which is the correct order of steps taken by B and T cells to defend against infection in body fluids and cells?1. B and T cells move to the lymph nodes, spleen, and other parts of the lymphatic system.2. B and T cells leave the bone marrow and thymus and move to the bloodstream.3. B and T cells meet and begin to fight viruses or other infectious agents.4. B and T cells develop antigen receptors.

A mRNA codon reads CAA.  According to this chart, which amino acid does this code for?   

                 top                      bottom Which color DNA band is the smallest?   

Both cellular respiration and fermentation begin with a pathway called ______________. 

What pigment is found at letter X (orange arrow)? 

What part of photosynthesis takes place in the light green area of the model? 

This cell is undergoing cell division. It has a 2N number of 6. In what specific phase or stage of meiotic nuclear division is the cell?

Which of the following animals would most likely be able to exchange gases effectively when placed in a dry desert environment?

A dialysis bag with a solution of 40% sucrose was put in a beaker that contains 10% sucrose.  Complete the sentence: Water will flow from the___________% sucrose to the ___________% sucrose.  

Within the lungs of humans, gas exchange occurs across